Mobile communication system, base station apparatus, mobile station apparatus, mobile communication method, and integrated circuit

ABSTRACT

Provided are a mobile communication system and a mobile communication method in which a base station apparatus and a mobile station apparatus can efficiently transmit control information in case of communication is conducted by using a wide frequency band constructed by a plurality of component carriers. The mobile communication system in which the base station apparatus and the mobile station apparatus communicate by using the plurality of component carriers, wherein the base station apparatus allocates resources to the mobile station apparatus for transmitting HARQ control information, and the mobile station apparatus uses the allocated resources to transmit to the base station apparatus the HARQ control information for a physical downlink control channel and/or a physical downlink shared channel which are transmitted on a plurality of downlink component carriers, and also a scheduling request for requesting the allocation of uplink data transmission.

This application is a Continuation of U.S. application Ser. No.13/638,419, filed Sep. 28, 2012, which is a U.S. National Phase under 35U.S.C. §371 of International Application No. PCT/JP2011/055377, filedMar. 8, 2011.

TECHNICAL FIELD

The present invention relates to a mobile communication system made upof a base station apparatus and a mobile station apparatus, and a mobilecommunication method.

BACKGROUND ART

An international standardization project, 3GPP (3rd GenerationPartnership Project) is discussing specifications of a network developedfrom W-CDMA (Wideband-Code Division Multiple Access) and GSM (GlobalSystem for Mobile Communications) as a system of next-generationcellular mobile communication.

3GPP has been discussing cellular mobile communication systems for along time and has standardized the W-CDMA system as a third-generationcellular mobile communication system. HSDPA (High-Speed Downlink PacketAccess) with higher communication speed has been standardized and theservice is operated. 3GPP is currently also discussing development ofthe third-generation radio access technology (Long Term Evolution,hereinafter referred to as “LTE”) and LTE Advanced (hereinafter referredto as “LTE-A”) aimed at further increase in communication speed.

The OFDMA (Orthogonal Frequency Division Multiple Access) method and theSC-FDMA (Single Carrier-Frequency Division Multiple Access) method whichperform user-multiplexing using subcarriers that are at right angles toeach other are discussed as communication systems in LTE. Specifically,the OFDMA method is a multi-carrier communication method and is proposedfor downlink, and the SC-FDMA method is a single-carrier communicationmethod and is proposed for uplink.

On the other hand, for communication methods in LTE-A, it is discussedto introduce the OFDMA method for downlink and the Clustered-SC-FDMA(Clustered-Single Carrier-Frequency Division Multiple Access, alsoreferred to as DFT-s-OFDM with Spectrum Division Control or DFT-precodedOFDM) method for uplink in addition to the SC-FDMA method. The SC-FDMAmethod and the Clustered-SC-FDMA system proposed as uplink communicationmethods in LTE and LTE-A are characterized in that PAPR (Peak to AveragePower Ratio) at the time of transmission of data (information) can besuppressed to a lower level.

While a typical mobile communication system uses a continuous frequencyband, it is discussed for LTE-A to use a plurality ofcontinuous/non-continuous frequency bands (hereinafter referred to as“carrier elements, carrier components (CC)” or “element carriers,component carriers (CC)”) in a composite manner to implement operationas one frequency band (a wider frequency band) (frequency bandaggregation, also referred to as spectrum aggregation, carrieraggregation, and frequency aggregation). It is also proposed to givedifferent frequency bandwidths to a frequency band used for downlinkcommunication and a frequency band used for uplink communication so thata base station apparatus and a mobile station apparatus more flexiblyuse a wider frequency band to perform communication (asymmetricfrequency band aggregation: asymmetric carrier aggregation) (Non-patentLiterature 1).

FIG. 8 is a diagram for explaining frequency band aggregation in aconventional technique. Giving the same bandwidth to a frequency bandused for downlink (DL) communication and a frequency band used foruplink (UL) communication as depicted in FIG. 8 is also referred to assymmetric frequency band aggregation (symmetric carrier aggregation). Asdepicted in FIG. 8, a base station apparatus and a mobile stationapparatus use a plurality of component carriers that arecontinuous/non-continuous frequency bands in a composite manner, therebyperforming communication in a wider frequency band made up of aplurality of component carriers. In this case, byway of example, it isdepicted that a frequency band used for the downlink communication witha bandwidth of 100 MHz (hereinafter also referred to as a DL system bandor a DL system bandwidth) is made up of five component carriers (DCC1:Downlink Component Carrier 1, DCC2, DCC3, DCC4, and DCC5) each having abandwidth of 20 MHz. By way of example, it is also depicted that afrequency band used for the uplink communication with a bandwidth of 100MHz (hereinafter also referred to as a UL system band or a UL systembandwidth) is made up of five component carriers (UCC1: Uplink ComponentCarrier 1, UCC2, UCC3, UCC4, and UCC5) each having a bandwidth of 20MHz.

In FIG. 8, downlink channels such as a physical downlink control channel(hereinafter, PDCCH) and a physical downlink shared channel(hereinafter, PDSCH) are mapped on each of the downlink componentcarriers. And the base station apparatus uses the PDCCH to transmit tothe mobile station apparatus control information for transmitting adownlink transport block transmitted by using the PDSCH on each of thedownlink component carriers (such as resource allocation information,MCS (Modulation and Coding Method) information, and HARQ (HybridAutomatic Repeat ReQuest) process information) (uses the PDCCH toallocate the PDSCH to the mobile station apparatus) and uses the PDSCHto transmit the downlink transport block to the mobile stationapparatus.

Uplink channels such as a physical uplink control channel (hereinafter,PUCCH) and a physical uplink shared channel (hereinafter, PUSCH) aremapped on each of the uplink component carriers. And the mobile stationapparatus uses the PUCCH and/or the PUSCH on each of the uplinkcomponent carriers to transmit to the base station apparatus controlinformation of HARQ (hereafter described as HARQ control information)for the PDCCH and/or the downlink transport block. The HARQ controlinformation includes a signal (information) indicative of ACK/NACK(Positive Acknowledgement/Negative Acknowledgement, ACK signal or NACKsignal) and/or a signal (information) indicative of DTX (DiscontinuousTransmission) for the PDCCH and/or the downlink transport block. The DTXis a signal (information) indicating that the mobile station apparatuscannot detect the PDCCH from the base station apparatus (or may be asignal (information) indicative of whether the mobile station apparatuscan detect PDCCH). In FIG. 8, any of downlink/uplink channels such asthe PDCCH, the PDSCH, the PUCCH, and the PUSCH may not be mapped on somedownlink/uplink component carriers.

Similarly, FIG. 9 is a diagram for explaining asymmetric frequency bandaggregation in a conventional technique. As depicted in FIG. 9, the basestation apparatus and the mobile station apparatus give differentbandwidths to a frequency band used for downlink communication and afrequency band used for uplink communication and use component carriersmaking up these frequency bands in a composite manner, therebyperforming communication in a wider frequency band. In this case, by wayof example, it is depicted that a frequency band used for the downlinkcommunication with a bandwidth of 100 MHz is made up of five downlinkcomponent carriers (DCC1, DCC2, DCC3, DCC4, and DCC5) each having abandwidth of 20 MHz, and that a frequency band used for the uplinkcommunication with a bandwidth of 40 MHz is made up of two componentcarriers (UCC1 and UCC2) each having a bandwidth of 20 MHz. In FIG. 9,downlink/uplink channels are mapped on each of the downlink/uplinkcomponent carriers. And the base station apparatus uses the PDSCHallocated by the PDCCH to transmit a transport block to the mobilestation apparatus. And the mobile station apparatus uses the PUCCHand/or the PUSCH to transmit the HARQ control information to the basestation apparatus.

To transmit the HARQ control information for transmission of PDCCHsand/or PDSCHs on a plurality of downlink component carriers, the mobilestation apparatus must transmit to the base station apparatusinformation indicative of ACK, NACK, and DTX for a PDCCH and/or a PDSCHtransmitted on each of the component carriers. For example, if the basestation apparatus performs transmission of PDCCHs and/or PDSCHs on fivedownlink component carriers, the mobile station apparatus must supplyinformation indicative as defined in any one of ACK, NACK, and DTX andtherefore must transmit information capable of indicating the fifthpower of three types of state (243 types of state) to the base stationapparatus. To represent these types of state as bit information, eightbits (capable of representing 256 types of state) are required asinformation bits.

Non-patent Literature 2 proposes a transmission method in which abasestation apparatus allocates to a mobile station apparatus a plurality ofPUCCH resources for transmission of the HARQ control information suchthat the mobile station apparatus selects one PUCCH resource from theallocated PUCCH resources to transmit the HARQ control information tothe base station apparatus by using the selected PUCCH resource. Forexample, the base station apparatus allocates to the mobile stationapparatus the PUCCH resources corresponding to respective PDSCHstransmitted on a plurality of downlink component carriers and the mobilestation apparatus selects one PUCCH resource from a plurality of PUCCHresources to transmit the HARQ control information by using the selectedPUCCH resource. The base station apparatus extracts the PUCCH resourceselected by the mobile station apparatus in addition to bit informationtransmitted by the mobile station apparatus so as to transmit/receiveinformation indicative of the HARQ control information between the basestation apparatus and the mobile station apparatus.

PRIOR ART DOCUMENTS Nonpatent Literatures

-   Non-patent Literature 1: “Carrier aggregation in LTE-Advance”, 3GPP    TSG RAN WG1 #53bis, R1-082468-   Non-patent Literature 2: “ACK/NACK transmission methods for carrier    aggregation”, 3GPP TSG RAN WG1 #59bis, R1-100366

SUMMARY OF THE INVENTION Problem to be Solved by the Invention

However, in a conventional technique, a large number of pieces ofcontrol information (uplink control information, UCI) must be exchangedbetween a base station apparatus and a mobile station apparatus inaddition to the HARQ control information and these pieces of controlinformation cannot efficiently be transmitted/received.

Since LTE-A involves transmission on a plurality of component carriers,transmission of a large number of pieces of control information isrequested and these pieces of control information must efficiently betransmitted/received. However, in a conventional technique, for example,a base station apparatus must frequently allocate both an uplinkresource for transmitting the HARQ control information and an uplinkresource for transmitting the other control information. For example, ifthe timing of transmitting the HARQ control information to the basestation apparatus coincides with the timing of transmitting the othercontrol information, the mobile station apparatus must suspend(postpone, drop) the transmission of the HARQ control information or theother control information. Specifically, in case of the transmission ofpieces of control information is suspended (postponed, dropped), themobile station apparatus must use an uplink resource of the next timingallocated by the base station apparatus to transmit these pieces ofcontrol information. Therefore, a conventional technique has a problemof reduction in throughput of a mobile communication system.

The present invention was conceived in view of the situations and it istherefore an object of the present invention to provide a mobilecommunication system and a mobile communication method in which the basestation apparatus and the mobile station apparatus efficiently transmitthe HARQ control information as well as the other control information incase of performing communication by using a wide frequency band made upof a plurality of component carriers, thereby preventing reduction inthroughput of the mobile communication system.

Means for Solving the Problem

To achieve the object, the present invention has taken the followingmeasures. That is, a mobile communication system of the presentinvention is a mobile communication system in which a base stationapparatus and a mobile station apparatus perform communication by usingaggregated component carriers, comprising: the base station apparatuswhich transmits, to the mobile station apparatus, first information forsetting a plurality of physical uplink control channel resources byusing a radio resource control signal, the base station apparatus whichtransmits, to the mobile station apparatus, second information fordetermining one physical uplink control channel resource from among theplurality of the physical uplink control channel resources by using aphysical downlink control channel, the mobile station apparatus whichtransmits, to the base station apparatus, Hybrid Automatic RepeatRequest (HARQ) control information and a scheduling request by using thephysical uplink control channel resource determined based on the secondinformation transmitted by using the physical downlink control channel.

A mobile communication system in which a mobile station apparatustransmits, to a base station apparatus, Hybrid Automatic Repeat Request(HARQ) control information for one or a plurality of downlink transportblocks, comprising: the base station apparatus which transmits, to themobile station apparatus, first information for setting a plurality ofphysical uplink control channel resources by using a radio resourcecontrol signal, the base station apparatus which transmits, to themobile station apparatus, second information for determining onephysical uplink control channel resource from among the plurality of thephysical uplink control channel resources by using a physical downlinkcontrol channel, the mobile station apparatus which transmits, to thebase station apparatus, the HARQ control information and a schedulingrequest by using the physical uplink control channel resource determinedbased on the second information transmitted by using the physicaldownlink control channel.

A base station apparatus in a mobile communication system in which thebase station apparatus and a mobile station apparatus performcommunication by using aggregated component carriers, comprising: atransmitting portion which transmits, to the mobile station apparatus,first information for setting a plurality of physical uplink controlchannel resources by using a radio resource control signal; thetransmitting portion which transmits, to the mobile station apparatus,second information for determining one physical uplink control channelresource from among the plurality of the physical uplink control channelresources by using a physical downlink control channel; and a receivingportion which receives, from the mobile station apparatus, HybridAutomatic Repeat Request (HARQ) control information and a schedulingrequest by using the physical uplink control channel resource determinedbased on the second information transmitted by using the physicaldownlink control channel.

In the above base station apparatus, the HARQ control informationincludes information indicative of a positive acknowledgement/a negativeacknowledgement.

A base station apparatus in a mobile communication system in which amobile station apparatus transmits, to the base station apparatus,Hybrid Automatic Repeat Request (HARQ) control information for one or aplurality of downlink transport blocks, comprising: a transmittingportion which transmits, to the mobile station apparatus, firstinformation for setting a plurality of physical uplink control channelresources by using a radio resource control signal; the transmittingportion which transmits, to the mobile station apparatus, secondinformation for determining one physical uplink control channel resourcefrom among the plurality of the physical uplink control channelresources by using a physical downlink control channel; and a receivingportion which is receives, from the mobile station apparatus, the HARQcontrol information and a scheduling request by using the physicaluplink control channel resource determined based on the secondinformation transmitted by using the physical downlink control channel.

In the above base station apparatus, a bit of the scheduling request isappended at the end of a bit sequence of the HARQ control information.

In the above base station apparatus, the scheduling request is one-bitinformation indicating that scheduling is requested to the base stationapparatus or that scheduling is not requested to the base stationapparatus.

In the above base station apparatus, four physical uplink controlchannel resources are set by the radio resource control signal.

A mobile station apparatus in a mobile communication system in which abase station apparatus and the mobile station apparatus performcommunication by using aggregated component carriers, comprising: areceiving portion which receives, from the base station apparatus, firstinformation for setting a plurality of physical uplink control channelresources by using a radio resource control signal; the receivingportion which receives, from the base station apparatus, secondinformation for determining one physical uplink control channel resourcefrom among the plurality of the physical uplink control channelresources by using a physical downlink control channel; and atransmitting portion which transmits, to the base station apparatus,Hybrid Automatic Repeat Request (HARQ) control information and ascheduling request by using the physical uplink control channel resourcedetermined based on the second information transmitted by using thephysical downlink control channel.

In the above mobile station apparatus, the HARQ control informationincludes information indicative of a positive acknowledgement/a negativeacknowledgement.

A mobile station apparatus in a mobile communication system in which themobile station apparatus transmits, to a base station apparatus, HybridAutomatic Repeat Request (HARQ) control information for one or aplurality of downlink transport blocks, comprising: a receiving portionwhich receives, from the base station apparatus, first information forsetting a plurality of physical uplink control channel resources byusing a radio resource control signal; the receiving portion whichreceives, from the base station apparatus, second information fordetermining one physical uplink control channel resource from among theplurality of the physical uplink control channel resources by using aphysical downlink control channel; and a transmitting portion whichtransmits, to the base station apparatus, the HARQ the controlinformation and a scheduling request by using the physical uplinkcontrol channel resource determined based on the second informationtransmitted by using the physical downlink control channel.

In the above mobile station apparatus, a bit of the scheduling requestis appended at the end of a bit sequence of the HARQ controlinformation.

In the above mobile station apparatus, the scheduling request is one-bitinformation indicating that scheduling is requested to the base stationapparatus or that scheduling is not requested to the base stationapparatus.

In the above mobile station apparatus, four physical uplink controlchannel resources are set by the radio resource control signal.

A communication method of a base station apparatus in a mobilecommunication system in which the base station apparatus and a mobilestation apparatus perform communication by using aggregated componentcarriers, comprising: transmitting, to the mobile station apparatus,first information for setting a plurality of physical uplink controlchannel resources by using a radio resource control signal;transmitting, to the mobile station apparatus, second information fordetermining one physical uplink control channel resource from among theplurality of the physical uplink control channel resources by using aphysical downlink control channel; and receiving, from the base stationapparatus, Hybrid Automatic Repeat Request (HARQ) control informationand a scheduling request by using the physical uplink control channelresource determined based on the second information transmitted by usingthe physical downlink control channel.

A communication method of a base station apparatus in a mobilecommunication system in which a mobile station apparatus transmits, tothe base station apparatus, Hybrid Automatic Repeat Request (HARQ)control information for one or a plurality of downlink transport blocks,comprising: transmitting, to the mobile station apparatus, firstinformation for setting a plurality of physical uplink control channelresources by using a radio resource control signal; transmitting, to themobile station apparatus, second information for determining onephysical uplink control channel resource from among the plurality of thephysical uplink control channel resources by using a physical downlinkcontrol channel; and receiving, from the mobile station apparatus, theHARQ control information and a scheduling request by using the physicaluplink control channel resource determined based on the secondinformation transmitted by using the physical downlink control channel.

A communication method of a mobile station apparatus in a mobilecommunication system in which a base station apparatus and the mobilestation apparatus perform communication by using aggregated componentcarriers, comprising: receiving, from the base station apparatus, firstinformation for setting a plurality of physical uplink control channelresources by using a radio resource control signal; receiving, from thebase station apparatus, second information for determining one physicaluplink control channel resource from among the plurality of the physicaluplink control channel resources by using a physical downlink controlchannel; and transmitting, to the base station apparatus, HybridAutomatic Repeat Request (HARQ) control information and a schedulingrequest by using the physical uplink control channel resource determinedbased on the second information transmitted by using the physicaldownlink control channel.

A communication method of a mobile station apparatus in a mobilecommunication system in which the mobile station apparatus transmits, toa base station apparatus, Hybrid Automatic Repeat Request (HARQ) controlinformation for one or a plurality of downlink transport blocks,comprising: receiving, from the base station apparatus, firstinformation for setting a plurality of physical uplink control channelresources by using a radio resource control signal; receiving, from thebase station apparatus, second information for determining one physicaluplink control channel resource from among the plurality of the physicaluplink control channel resources by using a physical downlink controlchannel; and transmitting, to the base station apparatus, the HARQcontrol information and a scheduling request by using the physicaluplink control channel resource determined based on the secondinformation transmitted by using the physical downlink control channel.

An integrated circuit mounted on a base station apparatus in a mobilecommunication system in which the base station apparatus and a mobilestation apparatus perform communication by using aggregated componentcarriers, the integrated circuit executing the processes of:transmitting, to the mobile station apparatus, first information forsetting a plurality of physical uplink control channel resources byusing a radio resource control signal; transmitting, to the mobilestation apparatus, second information for determining one physicaluplink control channel resource from among the plurality of the physicaluplink control channel resources by using a physical downlink controlchannel; and receiving, from the mobile station apparatus, HybridAutomatic Repeat Request (HARQ) control information and a schedulingrequest by using the physical uplink control channel resource determinedbased on the second information transmitted by using the physicaldownlink control channel.

An integrated circuit mounted on a base station apparatus in a mobilecommunication system in which a mobile station apparatus transmits, tothe base station apparatus, Hybrid Automatic Repeat Request (HARQ)control information for one or a plurality of downlink transport blocks,the integrated circuit executing the processes of: transmitting, to themobile station apparatus, first information for setting a plurality ofphysical uplink control channel resources by using a radio resourcecontrol signal; transmitting, to the mobile station apparatus, secondinformation for determining one physical uplink control channel resourcefrom among the plurality of the physical uplink control channelresources by using a physical downlink control channel; and receiving,from the mobile station apparatus, the HARQ control information and ascheduling request by using the physical uplink control channel resourcedetermined based on the second information transmitted by the physicaldownlink control channel.

An integrated circuit mounted on a mobile station apparatus in a mobilecommunication system in which a base station apparatus and the mobilestation apparatus perform communication by using aggregated componentcarriers, the integrated circuit executing the processes of: receiving,from the base station apparatus, first information for setting aplurality of physical uplink control channel resources by using a radioresource control signal; receiving, from the base station apparatus,second information for determining one physical uplink control channelresource from among the plurality of the physical uplink control channelresources by using a physical downlink control channel; andtransmitting, to the base station apparatus, Hybrid Automatic RepeatRequest (HARQ) control information and a scheduling request by using thephysical uplink control channel resource determined based on the secondinformation transmitted by using the physical downlink control channel.

An integrated circuit mounted on a mobile station apparatus in a mobilecommunication system in which the mobile station apparatus transmits, toa base station apparatus, Hybrid Automatic Repeat Request (HARQ) controlinformation for one or a plurality of downlink transport blocks, theintegrated circuit executing the processes of: receiving, from the basestation apparatus first information for setting a plurality of physicaluplink control channel resources by using a radio resource controlsignal; receiving, from the base station apparatus, second informationfor determining one physical uplink control channel resource from amongthe plurality of the physical uplink control channel resources by usinga physical downlink control channel; and transmitting, to the basestation apparatus, the HARQ control information and a scheduling requestby using the physical uplink control channel resource determined basedon the second information transmitted by using the physical downlinkcontrol channel.

Effect of the Invention

The present invention enables the base station apparatus and the mobilestation apparatus to efficiently transmit the HARQ control informationas well as the other control information in case of performingcommunication by using a wide frequency band made up of a plurality ofcomponent carriers, thereby preventing reduction in throughput of themobile communication system.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a conceptual diagram of a configuration of physical channelsaccording to an embodiment of the present invention.

FIG. 2 is a block diagram of a general configuration of a base stationapparatus according to the embodiment of the present invention.

FIG. 3 is a block diagram of a general configuration of a mobile stationapparatus according to the embodiment of the present invention.

FIG. 4 is a diagram of an example of a mobile communication system towhich the embodiment of the present invention is applicable.

FIG. 5 is a diagram of an example of a sequence chart to which theembodiment of the present invention is applicable.

FIG. 6 is a diagram of an example of a configuration of a table to whichthe embodiment of the present invention is applicable.

FIG. 7 is a diagram of another example of a configuration of a table towhich the embodiment of the present invention is applicable.

FIG. 8 is a diagram of an example of frequency band aggregation in aconventional technique.

FIG. 9 is a diagram of an example of asymmetric frequency bandaggregation in a conventional technique.

MODES FOR CARRYING OUT THE INVENTION

Embodiments according to the present invention will now be describedwith reference to the drawings. FIG. 1 is a diagram of one exemplaryconfiguration of channels of an embodiment of the present invention.Downlink physical channels are made up of a physical broadcast channel(PBCH), a PDCCH, a PDSCH, and a physical hybrid ARQ indicator channel(PHICH). Uplink physical channels are made up of a PUSCH and a PUCCH.

The PBCH maps a broadcast channel (BCH) at intervals of 40 milliseconds.Blind detection is performed for the timing of 40 milliseconds.Therefore, explicit signaling is not performed for the presentation ofthe timing. A sub-frame including the PBCH can be decoded by itself(self-decodable).

The PDCCH is a channel used for transmitting downlink controlinformation. The PDCCH is a channel used for notifying a mobile stationapparatus of resource allocation of the PDSCH, and uplink transmissionpermission that is resource allocation of the PUSCH. The PDCCH is madeup of a plurality of CCEs, and a mobile station apparatus detects thePDCCH made up of the CCEs to receive the PDCCH from a base stationapparatus. A CCE is made up of a plurality of resource element groups(REGs, also referred to as mini-CCEs) distributed in frequency and timedomains. A resource element is a unit resource made up of one OFDMsymbol (time component) and one sub-carrier (frequency component) and,for example, an REG is made up of four downlink resource elementsconsecutive in the frequency domain, except a downlink pilot channel, inthe frequency domain in the same OFDM symbol. For example, one PDCCH ismade up of one, two, four, and eight CCEs having the consecutive numbersidentifying the CCEs (CCE index).

The PDCCH is separately coded (subjected to separate coding) accordingto a mobile station apparatus and type. That is, a mobile stationapparatus detects a plurality of PDCCHs and acquires downlink or uplinkresource allocation and information indicative of the other controlinformation. A value of CRC (cyclic redundancy check) is transmitted oneach PDCCH and a mobile station apparatus performs CRC for each set ofCCEs that may make up a PDCCH and acquires a PDCCH of successful CEC.This is referred to as blind decoding and, with regard to a set of CCEsthat may make up a PDCCH subjected to the blind decoding by a mobilestation apparatus, the range thereof is referred to as a search space.That is, a mobile station apparatus performs the blind decoding for CCEsin the search space to detect a PDCCH.

If resource allocation of a PDSCH is transmitted on a PDCCH, a mobilestation apparatus uses the PDSCH to receive a downlink signal (data)(downlink data (a downlink shared channel (DL-SCH)), and/or downlinkcontrol data) in accordance with the resource allocation specified bythe PDCCH from a base station apparatus. That is, the PDCCH is used fortransmitting a signal performing resource allocation to downlink(hereinafter referred to as “downlink transmission permission signal” or“downlink grant”). If resource allocation of a PUSCH is transmitted on aPDCCH, a mobile station apparatus uses the PUSCH to transmit an uplinksignal (data) (uplink data (an uplink shared channel (UL-SCH)), and/oruplink control data) in accordance with the resource allocationspecified by the PDCCH from a base station apparatus. Therefore, thePDCCH is used for transmitting a signal permitting data transmission touplink (hereinafter referred to as “uplink transmission permissionsignal” or “uplink grant”).

The PDSCH is a channel used for transmitting the downlink data (thedownlink shared channel (DL-SCH)) or paging information (a pagingchannel (PCH)). The downlink data (the downlink shared channel (DL-SCH))indicates transmission of user data, for example, and the DL-SCH is atransport channel. The DL-SCH supports HARQ and dynamic adaptive radiolink control. The DL-SCH supports dynamic resource allocation andquasi-static resource allocation.

The PUSCH is a channel mainly used for transmitting the uplink data (theuplink shared channel: UL-SCH). If a base station apparatus schedules amobile station apparatus, uplink control data (control information,uplink control information) is also transmitted by using the PUSCH. Thisuplink control data includes channel state information CSI (channelstate information or channel statistical information), a downlinkchannel quality indicator CQI, a precoding matrix indicator PMI, a rankindicator RI, and HARQ control information for transmission of adownlink signal (a downlink transport block). The HARQ controlinformation for transmission of a downlink signal includes informationindicative of ACK/NACK and/or information indicative of DTX for PDCCHsand/or downlink transport blocks. The DTX is information indicating thata mobile station apparatus cannot detect the PDCCH from a base stationapparatus. In the PUSCH, data is transmitted to abase station apparatusafter adding a 24-bit CRC code generated by using a predeterminedgenerating polynomial from data to be transmitted through the PUSCH(uplink transport blocks).

The uplink data (UL-SCH) and the downlink data (DL-SCH) may include aradio resource control signal exchanged between a base station apparatusand a mobile station apparatus (hereinafter referred to as a “RRCsignaling: a Radio Resource Control Signaling”), a MAC (Medium AccessControl) control elements, etc. The RRC signaling indicates signalsexchanged through a higher layer (ratio resource control layer) betweena base station apparatus and a mobile station apparatus.

The PUCCH is a channel used for transmitting uplink control data(control information, uplink control information). The uplink controldata includes a scheduling request, for example. The scheduling requestis used by a mobile station apparatus for requesting UL-SCH resources toa base station apparatus. That is, the mobile station apparatustransmits the scheduling request to the base station apparatus in caseof requesting allocation of resources for transmission of uplink data(requesting allocation of resources for transmission through theUL-SCH).

In this case, if the base station apparatus and the mobile stationapparatus perform communication by using a plurality of componentcarriers, the scheduling request is transmitted from the mobile stationapparatus in case that the mobile station requests allocation ofresources for transmission of uplink data on a plurality of uplinkcomponent carriers. In other words, the mobile station apparatustransmits a scheduling request to the base station apparatus so as tomake a transmission request on PUSCHs on a plurality of uplink componentcarriers. In case of receiving the scheduling request from the mobilestation apparatus, the base station apparatus allocates resources on aplurality of uplink component carriers to the mobile station apparatusin consideration of a resource status in a managed cell etc.

That is, for example, in case that a base station apparatus and a mobilestation apparatus perform communication by using two uplink componentcarriers (UCC1 and UCC2 of FIG. 9), the mobile station apparatustransmits a scheduling request to request resources for transmittinguplink data on UCC1 and/or UCC2 from the base station apparatus. In caseof receiving the scheduling request from the mobile station apparatus,the base station apparatus allocates resources for transmitting theuplink data on UCC1 and/or UCC2 to the mobile station apparatus inconsideration of a resource status in a managed cell etc.

The uplink control data includes the channel state information CSI(channel state information or channel statistical information), thedownlink channel quality indicator CQI, the precoding matrix indicatorPMI, and the rank indicator RI transmitted (fed back) from the mobilestation apparatus to the base station apparatus.

ACK and NACK are used for HARQ. HARQ combines automatic repeat request(ARQ) with error-correcting coding such as turbo coding to provide errorcontrol. For example, in the case of HARQ using chaise combining (CC),when an error is detected in a reception packet, retransmission of thecompletely same packet is requested and these two reception packets arecombined to improve reception quality. In the case of HARQ usingincremental redundancy (IR), since redundancy bits are divided and thedivided bits are sequentially retransmitted bit by bit, a coded rate isreduced as the number of times of retransmission increases, therebyensuring enhanced error-correcting capability.

On the PUCCH, code spreading is performed in a frequency directionutilizing a CAZAC (Constant Amplitude and Zero Auto-Correlation)sequence having a sequence length of 12 in a frequency direction (12subcarriers) and a time direction (for estimating a propagation channel)for one schedule unit (two resource blocks). The CAZAC sequence is asequence having constant amplitude and excellent auto-correlationcharacteristics in the time and frequency domains. Because of theconstant amplitude in the time domain, PAPR (Peak to Average PowerRatio) can be suppressed to a lower level. For example, on the PUCCH,multiplexing of users can be achieved by giving a cyclic shift (cyclicdelay) to the CAZAC sequence having a length of 12. When the HARQcontrol information is transmitted, a block code enables utilization ofthe code spreading in the time domain and, specifically, a Walsh codehaving a sequence length of four can be used. As described above, whenthe HARQ control information is transmitted, PUCCH resources enable theuser multiplexing to be achieved by using codes in the same time andfrequency resources.

[Configuration of Base Station Apparatus]

FIG. 2 is a block diagram of a general configuration of a base stationapparatus 200 according to an embodiment of the present invention. Thebase station apparatus 200 includes a data control portion 201, an OFDMmodulating portion 202, a radio portion 203, a scheduling portion 204, achannel estimating portion 205, a DFT-Spread-OFDM (DFT-S-OFDM)demodulating portion 206, a data extracting portion 207, and a higherlayer 208. A receiving portion is made up of the radio portion 203, thescheduling portion 204, the channel estimating portion 205, theDFT-Spread-OFDM (DFT-S-OFDM) demodulating portion 206, the dataextracting portion 207, and the higher layer 208, and a transmittingportion is made up of the data control portion 201, the OFDM modulatingportion 202, the radio portion 203, the scheduling portion 204, and thehigher layer 208.

The radio portion 203, the channel estimating portion 205, theDFT-Spread-OFDM (DFT-S-OFDM) demodulating portion 206, and the dataextracting portion 207 execute processing of an uplink physical layer.The radio portion 203, the OFDM modulating portion 202, and the datacontrol portion 201 execute processing of a downlink physical layer.

The data control portion 201 receives transport channels and schedulinginformation from the scheduling portion 204. The data control portion201 maps the transport channels as well as signals and channelsgenerated in the physical layer to physical channels based on thescheduling information input from the scheduling portion 204. The datamapped as described above are output to the OFDM modulating portion 202.

The OFDM modulating portion 202 executes OFDM signal processing such asencoding, data modulation, input signal serial/parallel conversion, theIFFT (Inverse Fast Fourier Transform) processing, CP (cyclic prefix)insertion, and filtering for data input from the data control portion201 to generate and output an OFDM signal to the radio portion 203 basedon the scheduling information from the scheduling portion 204 (includingdownlink physical resource block PRB allocation information (e.g.,physical resource block position information such as frequency andtime), and a modulation method and a coding method corresponding to eachPRB (e.g., 16QAM modulation, 2/3 coding rate)).

The radio portion 203 up-converts the modulated data input from the OFDMmodulating portion 202 to a radio frequency to generate and transmit aradio signal via an antenna (not depicted) to a mobile station apparatus300. The radio portion 203 receives an uplink radio signal from themobile station apparatus 300 via the antenna (not depicted) anddown-converts the signal to a baseband signal to output reception datato the channel estimating portion 205 and the DFT-S-OFDM demodulatingportion 206.

The scheduling portion 204 executes processing of a medium accesscontrol (MAC) layer. The scheduling portion 204 performs the mapping oflogical channels and transport channels, the scheduling of downlink anduplink (such as HARQ processing and selection of transport format), etc.

In the downlink scheduling, the scheduling portion 204 executes aselection processing of a downlink transport format (transmission form)for modulating data (such as allocation of physical resource blocks anda modulating method and a coding method) and provides retransmissioncontrol of HARQ, based on uplink feedback information received from themobile station apparatus 300 (such as downlink channel feedbackinformation (channel state information (channel quality, the number ofstreams, and precoding information)) and ACK/NACK feedback informationfor downlink data), information of usable PRBs of mobile stationapparatuses, a buffer status, the scheduling information input from thehigher layer 208, etc. The scheduling information used for the downlinkscheduling is output to the data control portion 201.

In the uplink scheduling, the scheduling portion 204 executes aselection processing of an uplink transport format (transmission form)for modulating data (such as allocation of physical resource blocks anda modulating method and a coding method) based on an estimation resultof an uplink channel state (radio propagation channel state) output bythe channel estimating portion 205, a resource allocation request fromthe mobile station apparatus 300, information of usable PRBs of themobile station apparatuses 300, the scheduling information input fromthe higher layer 208, etc. The scheduling information used for theuplink scheduling is output to the data control portion 201.

The scheduling portion 204 maps the downlink logical channels input fromthe higher layer 208 to the transport channels and outputs to the datacontrol portion 201. The scheduling portion 204 processes the controldata acquired through uplink and the transport channels input from thedata extracting portion 207 as needed and maps the control data and thetransport channels to the uplink logical channels and outputs to thehigher layer 208.

The channel estimating portion 205 estimates an uplink channel statefrom an uplink demodulation reference signal (DRS) for the demodulationof uplink data and outputs the estimation result to the DFT-S-OFDMdemodulating portion 206. The channel estimating portion 205 alsoestimates an uplink channel state from an uplink sounding referencesignal (SRS) for scheduling the uplink and outputs the estimation resultto the scheduling portion 204. Although it is assumed that the uplinkcommunication system is a single carrier system such as DFT-S-OFDM, amulticarrier system such as OFDM system may be used.

Based on the uplink channel state estimation result input from thechannel estimating portion 205, the DFT-S-OFDM demodulating portion 206executes DFT-S-OFDM signal processing such as DFT transform, sub-carriermapping, IFFT transform, and filtering for the modulated data input fromthe radio portion 203, executes the demodulating processing and outputsto the data extracting portion 207. If spreading using codes isperformed by the mobile station apparatus, the sequence utilized for thespreading is referenced from the scheduling portion 204 and de-spreadingis performed based on the sequence.

The data extracting portion 207 checks the correctness of the data inputfrom the DFT-S-OFDM demodulating portion 206 and outputs theconfirmation result (acknowledgement signal ACK/negative acknowledgementsignal NACK) to the scheduling portion 204. The data extracting portion207 divides the data input from the DFT-S-OFDM demodulating portion 206into the transport channels and the control data of the physical layer,which are output to the scheduling portion 204. The divided control dataincludes uplink feedback information supplied from the mobile stationapparatus 300 (a downlink channel feedback report CFR, ACK/NACK feedbackinformation for downlink data).

The higher layer 208 executes processing of a radio resource control(RRC) layer. The higher layer 208 has a radio resource control portion209 (also referred to as a control portion). The radio resource controlportion 209 performs management of various pieces of configurationinformation, management of system information, management ofcommunication states of mobile station apparatuses, management ofmigration such as handover, management of buffer status of each mobilestation apparatus, etc.

[Configuration of Mobile Station Apparatus]

FIG. 3 is a block diagram of a general configuration of the mobilestation apparatus 300 according to the embodiment of the presentinvention. The mobile station apparatus 300 includes a data controlportion 301, a DFT-S-OFDM modulating portion 302, a radio portion 303, ascheduling portion 304, a channel estimating portion 305, an OFDMdemodulating portion 306, a data extracting portion 307, and a higherlayer 308. A transmitting portion is made up of the data control portion301, the DFT-S-OFDM modulating portion 302, the radio portion 303, thescheduling portion 304, and the higher layer 308, and a receivingportion is made up of the radio portion 303, the scheduling portion 304,the channel estimating portion 305, the OFDM demodulating portion 306,the data extracting portion 307, and the higher layer 308.

The data control portion 301, the DFT-S-OFDM modulating portion 302, andthe radio portion 303 execute processing of the uplink physical layer.The radio portion 303, the channel estimating portion 305, the OFDMdemodulating portion 306, and the data extracting portion 307 executeprocessing of the downlink physical layer.

The data control portion 301 receives transport channels and schedulinginformation from the scheduling portion 304. The data control portion301 maps the transport channels as well as signals and channelsgenerated in the physical layer to the physical channels based on thescheduling information input from the scheduling portion 304. The datamapped as described above are output to the DFT-S-OFDM modulatingportion 302.

The DFT-S-OFDM modulating portion 302 executes DFT-S-OFDM signalprocessing such as data modulation, DFT (Discrete Fourier Transform)process, sub-carrier mapping, IFFT (Inverse Fast Fourier Transform)processing, CP insertion, and filtering for the data input from the datacontrol portion 301 to generate and output a DFT-S-OFDM signal to theradio portion 303. Although it is assumed that the uplink communicationsystem is a single carrier system such as DFT-S-OFDM, a multicarriersystem such as OFDM system may be used instead. If codes for spreadingare supplied from the base station apparatus, the codes may be utilizedfor spreading to generate a transmission signal.

The radio portion 303 up-converts the modulated data input from theDFT-S-OFDM modulating portion 302 to a radio frequency to generate andtransmit a radio signal via an antenna (not depicted) to the basestation apparatus 200. The radio portion 303 receives a radio signalmodulated with the downlink data from the base station apparatus 200 viathe antenna (not depicted) and down-converts the signal to a basebandsignal to output the reception data to the channel estimating portion305 and the OFDM demodulating portion 306.

The scheduling portion 304 executes processing of a medium accesscontrol (MAC) layer. The scheduling portion 304 performs the mapping oflogical channels and transport channels, the scheduling of downlink anduplink (such as HARQ processing and selection of transport format), etc.In the down link scheduling, the scheduling portion 304 provides thereception control of the transport channels as well as the physicalsignals and physical channels, and the HARQ retransmission control,based on the scheduling information from the base station apparatus 200and the higher layer 308 (the transport format and the HARQretransmission information).

In the uplink scheduling, the scheduling portion 304 executes ascheduling processing for mapping the uplink logical channels input fromthe higher layer 308 to the transport channels based on an uplink bufferstatus input from the higher layer 308, the uplink schedulinginformation from the base station apparatus 200 input from the dataextracting portion 307 (the transport format and the HARQ retransmissioninformation), and the scheduling information input from the higher layer308. For the uplink transport format, the information supplied from thebase station apparatus 200 is utilized. The scheduling information isoutput to the data control portion 301.

The scheduling portion 304 maps the uplink logical channels input fromthe higher layer 308 to the transport channels before output to the datacontrol portion 301. The scheduling portion 304 also outputs to the datacontrol portion 301 the downlink channel feedback report CFR (channelstate information) input from the channel estimating portion 305 and aCRC confirmation result input from the data extracting portion 307. Thescheduling portion 304 processes the control data acquired throughdownlink and the transport channels input from the data extractingportion 307 as needed and maps the control data and the transportchannels to the downlink logical channels and outputs to the higherlayer 308.

The channel estimating portion 305 estimates a downlink channel statefrom a downlink reference signal (RS) for the demodulation of downlinkdata and outputs the estimation result to the OFDM demodulating portion306. The channel estimating portion 305 estimates a downlink channelstate from a downlink reference signal (RS) for notifying the basestation apparatus 200 of an estimation result of a downlink channelstate (radio propagation channel state) and converts this estimationresult into downlink channel state feedback information (such as channelquality information), which is output to the scheduling portion 304.

The OFDM demodulating portion 306 executes the OFDM demodulationprocessing for the modulated data input from the radio portion 303 basedon the downlink channel state estimation result input from the channelestimating portion 305 and outputs the data to the data extractingportion 307.

The data extracting portion 307 performs CRC for the data input from theOFDM demodulating portion 306 to check the correctness and outputs theconfirmation result (ACK/NACK feedback information) to the schedulingportion 304. The data extracting portion 307 divides the data input fromthe OFDM demodulating portion 306 into the transport channels and thecontrol data of the physical layer, which are output to the schedulingportion 304. The divided control data includes the schedulinginformation such as downlink or uplink resource allocation and uplinkHARQ control information.

The higher layer 308 has a radio resource control portion 309. The radioresource control portion 309 performs management of various pieces ofconfiguration information, management of system information, managementof communication state of the mobile station, and management of handoveretc.

First Embodiment

A first embodiment of a mobile communication system using the basestation apparatus and the mobile station apparatus will be described. Inthe first embodiment, the base station apparatus allocates to the mobilestation apparatus a resource for transmission of the HARQ controlinformation by the mobile station apparatus, and the mobile stationapparatus uses the allocated resource to transmit to the base stationapparatus the HARQ control information for PDCCHs and/or PDSCHstransmitted on a plurality of downlink component carriers as well as ascheduling request requesting allocation of resources for transmissionof uplink data.

The base station apparatus allocates to the mobile station apparatus aresource for transmission of the scheduling request by the mobilestation apparatus and also allocates to the mobile station apparatus aresource for transmission of the HARQ control information by the mobilestation apparatus, and the mobile station apparatus uses the resourcefor transmission of the control information to transmit to the basestation apparatus the HARQ control information for PDCCHs and/or PDSCHstransmitted on a plurality of downlink component carriers as well as thescheduling request requesting allocation of resources for transmissionof uplink data.

In this case, the mobile station apparatus refers to one table combiningthe HARQ control information and the scheduling request. Specifically,the mobile station apparatus refers to one table combining the HARQcontrol information and the scheduling request and selects a bitsequence corresponding to the HARQ control information and thescheduling request from the referenced table to transmit the selectedbit sequence to the base station apparatus.

A table that indicates a bit sequence corresponding to the HARQ controlinformation for PDCCHs and/or PDSCHs on a plurality of downlinkcomponent carriers and the scheduling request may be varied depending onthe number of the downlink component carriers used for communication.Specifically, a table that indicates of a bit sequence corresponding tothe HARQ control information and the scheduling request may be varieddepending on the number of the downlink component carriers used for thecommunication set by the base station apparatus. If the schedulingrequest is transmitted on a PUSCH, it is assumed that the mobile stationapparatus transmits a scheduling request to the base station apparatusin advance and that a PUSCH resource is allocated from the base stationapparatus.

Although a frequency band is defined in bandwidth (Hz) in the firstembodiment, a frequency band may be defined in the number of resourceblocks (RBs) made up of frequency and time. Component carriers(hereinafter also referred to as “carrier components”, “elementcarriers”, or “carrier elements”) in this embodiment are (narrower)frequency bands aggregated in case that the base station apparatus andthe mobile station apparatus perform communication by using a widerfrequency band (or a system band). The base station apparatus and themobile station apparatus can aggregate a plurality of component carriersto make up a wider frequency band and use the plurality of componentcarriers in a composite manner, thereby realizing high-speed datacommunication (transmission/reception of information) (frequency bandaggregation described above). For example, the base station apparatusand the mobile station apparatus can aggregate five component carriershaving a bandwidth of 20 MHz to make up a wider frequency band having abandwidth of 100 MHz and use these five component carriers in acomposite manner to perform communication.

A component carrier indicates each of the (narrower) frequency bands(e.g., the frequency bands having a bandwidth of 20 MHz) making up thiswider frequency band (e.g., the frequency band having a bandwidth of 100MHz). A component carrier also indicates a (center) carrier frequency ofeach of the (narrower) frequency bands making up this wider frequencyband. That is, a downlink component carrier has a band (width) of aportion of the frequency band usable by the base station apparatus andthe mobile station apparatus at the time of transmission/reception of adownlink signal, and an uplink component carrier has a band (width) of aportion of the frequency band usable by the base station apparatus andthe mobile station apparatus at the time of transmission/reception of anuplink signal. A component carrier may be defined as a constituent unitof a certain physical channel (e.g., a PDCCH, a PDSCH, a PUCCH, and aPUSCH).

Component carriers may be mapped on continuous frequency bands or may bemapped on non-continuous frequency bands, and a wider frequency band isestablished by aggregating a plurality of component carriers that arecontinuous and/or non-continuous frequency bands. A frequency band (or adownlink system band or a downlink system bandwidth) used for downlinkcommunication made up of downlink component carriers may not necessarilyhave the same bandwidth as a frequency band (or an uplink system band oran uplink system bandwidth) used for uplink communication made up ofuplink component carriers. Even if the frequency band used for downlinkcommunication and the frequency band used for uplink communication havebandwidths different from each other, the base station apparatus and themobile station apparatus can use the component carriers in a compositemanner to perform communication (asymmetric frequency band aggregationdescribed above).

FIG. 4 depicts an example of a mobile communication system to which thefirst embodiment is applicable. FIG. 4 depicts that a frequency bandused for downlink communication having a bandwidth of 100 MHz is made upof five downlink component carriers (DCC1, DCC2, DCC3, DCC4, and DCC5)each having a bandwidth of 20 MHz, and that a frequency band used foruplink communication having a bandwidth of 100 MHz is made up of fiveuplink component carriers (UCC1, UCC2, UCC3, UCC4, and UCC5) each havinga bandwidth of 20 MHz. In FIG. 4, downlink/uplink channels are mapped oneach of the downlink/uplink component carriers. In FIG. 4, any ofdownlink/uplink channels such as a PDCCH, a PDSCH, a PUCCH, and a PUSCHmay not be mapped on some downlink/uplink component carriers.

In FIG. 4, the base station apparatus can use a PDCCH on a downlinkcomponent carrier to allocate a PDSCH. In FIG. 4, by way of example, itis depicted that the base station apparatus uses a PDCCH on DCC1 (aPDCCH indicated by diagonal lines) to allocate a PDSCH on DCC1 (thePDSCH on DCC1 is allocated by the PDCCH indicated by diagonal lines inDCC1).

In FIG. 4, the base station apparatus can transmit to the mobile stationa PDCCH on a downlink component carrier along with informationrepresentative of a component carrier indicator to allocate a PDSCH onthe downlink component carrier same as or different from the downlinkcomponent carrier on which the PDCCH is mapped. In FIG. 4, it isdepicted that the base station apparatus transmits to the mobile stationapparatus a PDCCH indicated by diagonal lines on DCC3 along withinformation representative of a component carrier indicator indicatingthat a PDSCH on DCC4 is allocated. The base station apparatus maytransmit to the mobile station apparatus a PDCCH indicated by diagonallines on DCC1 along with information representative of a componentcarrier indicator indicating that a PDSCH on DCC1 is allocated. The basestation apparatus may transmit to the mobile station apparatus a PDCCHindicated by diagonal lines on DCC3 along with informationrepresentative of a component carrier indicator indicating that a PDSCHon DCC3 is allocated.

In FIG. 4, the base station apparatus can use a plurality of PDCCHs ondownlink component carriers to allocate a plurality of PDSCHs in thesame sub-frame. In FIG. 4, by way of example, it is depicted that thebase station apparatus uses three PDSCHs on DCC1 and DCC3 (PUCCHsrespectively indicated by diagonal lines, grid lines, and mesh lines) toindicate that PDSCHs on DCC1, DCC3, and DCC4 are allocated (the PDSCH onDCC1 is allocated by the PDCCH indicated by diagonal lines on DCC1; thePDSCH on DCC3 is allocated by the PDCCH indicated by grid lines on DCC3;and the PDSCH on DCC4 is allocated by the PDCCH indicated by grid lineson DCC3). The base station apparatus can use the PDSCHs on DCC1, DCC3,and DCC4 to transmit (up to three) downlink transport blocks to themobile station apparatus in the same sub-frame.

In FIG. 4, the mobile station apparatus use respective PUSCHs on uplinkcomponent carriers to transmit a plurality of uplink transport blocks tothe base station apparatus in the same sub-frame. For example, themobile station apparatus uses five PUSCHs on UCC1, UCC2, UCC3, UCC4, andUCC5 to transmit (up to five) uplink transport blocks to the basestation apparatus in the same sub-frame.

In FIG. 4, the mobile station apparatus transmits to the base stationapparatus the HARQ control information for PDCCH(s) and/or downlinktransport block(s) transmitted from the base station apparatus. Forexample, the mobile station apparatus transmits to the base stationapparatus the HARQ control information for five PDCCHs and/or fivedownlink transport blocks transmitted in the same sub-frame from thebase station apparatus.

In FIG. 4, the base station apparatus allocates to the mobile stationapparatus a PUCCH resource for transmission of the HARQ controlinformation by the mobile station apparatus. For example, the basestation apparatus can use the RRC signaling to allocate to the mobilestation apparatus the PUCCH resource for transmission of the HARQcontrol information by the mobile station apparatus.

For example, the base station apparatus can allocate a PUCCH resourcefor transmission of the HRQ control information by the mobile stationapparatus for each PDSCH transmitted on downlink component carriers.Specifically, the base station apparatus can allocate the PUCCH resourcefor transmission of the HARQ control information by the mobile stationapparatus corresponding to a PDCCH allocating a PDSCH transmitted on adownlink component carrier (e.g., a position of a PDCCH in a PDCCHresource region).

The base station apparatus can set a plurality of PUCCH resources forthe mobile station apparatus. And the base station apparatus canindicate one PUCCH resource from among the plurality of the PUCCHresources to allocate the PUCCH resource for transmission of the HARQcontrol information by the mobile station apparatus. For example, basestation apparatus can use the RRC signaling to set a plurality of PUCCHresources. And the base station apparatus can transmit informationindicative of one PUCCH resource from among the plurality of the PUCCHresources by using the PDCCH. And the base station apparatus canallocate to the mobile station apparatus the PUCCH resource fortransmission of the HARQ control information by the mobile stationapparatus.

For example, the base station apparatus can use the RRC signaling to setfour PUCCH resources. And the base station apparatus can transmitinformation indicative of one PUCCH resource from among the four PUCCHresources by using the PDCCH. And the base station apparatus canallocate (indicate) the one PUCCH resource to the mobile stationapparatus. Since the base station apparatus allocates the PUCCH resourcefor transmission of the HARQ control information in this way, the PUCCHresource can flexibly be indicated to the mobile station apparatus.

In FIG. 4, the base station apparatus can use the RRC signaling toallocate to the mobile station apparatus a PUCCH resource fortransmission of the scheduling request by the mobile station apparatus.For example, the base station apparatus can periodically allocate to themobile station apparatus the PUCCH resource for transmission of thescheduling request by the mobile station apparatus. In this case, sincethe mobile station apparatus transmits the scheduling request by usingthe PUCCH resource for transmission of the HARQ control informationallocated by the base station apparatus, the PUCCH resource periodicallyallocated by using the RRC signaling can be reduced and a radio resourcecan efficiently be utilized.

In FIG. 4, the mobile station apparatus uses the PUCCH resourceallocated by the base station apparatus to transmit the HARQ controlinformation. Specifically, the mobile station apparatus uses the PUCCHallocated by the base station apparatus to transmit the HARQ controlinformation for PDCCHs and/or PDSCHs (or downlink transport blocks)transmitted on a plurality of downlink component carriers.

In FIG. 4, if the scheduling request is being transmitted to the basestation apparatus, the mobile station apparatus can transmit thescheduling request together with the HARQ control information to thebase station apparatus. Specifically, the mobile station apparatus cantransmit both the HARQ control information and the scheduling request byusing the PUCCH resource allocated by the base station apparatus fortransmission of the HARQ control information.

That is, the mobile station apparatus can transmit to the base stationapparatus the HARQ control information for PDCCHs and/or PDSCHstransmitted on a plurality of downlink component carriers as well as thescheduling request requesting allocation of resources for transmittinguplink data on a plurality of uplink component carriers. In this case,the mobile station apparatus transmits the scheduling request togetherwith the HARQ control information by using the PUCCH resource allocatedby the base station apparatus for transmission of the HARQ controlinformation.

FIG. 5 is a diagram of a sequence chart in case that the mobile stationapparatus transmits the scheduling request together with the HARQcontrol information to the base station apparatus. First, the basestation apparatus allocates to the mobile station apparatus a resourcefor transmission of the HARQ control information by the mobile stationapparatus (501). The base station apparatus may allocate to the mobilestation apparatus a resource for transmission of the scheduling requestby the mobile station apparatus. For example, the base station apparatususes the RRC signaling to allocate to the mobile station apparatus aPUCCH resource for transmission of the HARQ control information by themobile station apparatus. Also, for example, the base station apparatususes the RRC signaling to allocate to the mobile station apparatus aPUCCH resource for transmission of the scheduling request by the mobilestation apparatus. The base station apparatus may dynamically allocatethe PUCCH resource depending on a position of a PDCCH transmitted to themobile station apparatus in a PDCCH resource region. The base stationapparatus may use the RRC signaling to set a plurality of PUCCHresources for the mobile station apparatus and may transmit informationindicative of one PUCCH resource from among the plurality of the PUCCHresources by using a PDCCH. And the base station apparatus allocates thePUCCH resource to the mobile station apparatus. Although the basestation apparatus allocates a PUCCH resource as a resource fortransmission of the HARQ control information by the mobile stationapparatus in the description of FIG. 5, the base station apparatus mayallocate a PUSCH resource as a resource for transmission of the HARQcontrol information by the mobile station apparatus.

The base station apparatus then uses PDSCHs to transmit downlinktransport blocks to the mobile station apparatus (502). For example, thebase station apparatus uses PDSCHs on a plurality of downlink componentcarriers to transmit a plurality of downlink transport blocks to themobile station apparatus in the same sub-frame. The base stationapparatus can use a plurality of PDCCHs to allocate a plurality ofPDSCHs to the mobile station apparatus in the same sub-frame.

The base station apparatus can set the (number of) downlink componentcarriers used for communication to the mobile station apparatus. In FIG.5, by way of example, it is assumed that the base station apparatusconfigures the setting for the mobile station apparatus such thatcommunication is performed by using two downlink component carriers.That is, by way of example, it is assumed that the base stationapparatus uses respective PDSCHs on two downlink component carriers(i.e., uses two PDSCHs) to transmit two downlink transport blocks to themobile station apparatus in the same sub-frame.

The downlink component carriers used for communication set by the basestation apparatus include downlink component carriers activated by thebase station apparatus. Specifically, the base station apparatus can setdownlink component carriers used for communication to the mobile stationapparatus and can also activate downlink component carriers likely to bescheduled by the base station apparatus. For example, the base stationapparatus can use the RRC signaling to set the downlink componentcarriers used for communication. For example, the base station apparatuscan use the MAC signaling to activate the downlink component carrierslikely to be scheduled by the base station apparatus. In the followingdescription, for simplicity, it is described that the base stationapparatus sets downlink component carriers used for communication;however, these downlink component carriers include downlink componentcarriers set by the base station apparatus using the RRC signaling, forexample. These downlink component carriers also include downlinkcomponent carriers activated by the base station apparatus using the MACsignaling, for example.

The mobile station apparatus maps the HARQ control information for thetransmission of PDCCHs and/or PDSCHs (or downlink transport blocks) fromthe base station apparatus and the scheduling request on the resourceallocated by the base station apparatus (on the PUCCH resource in thiscase) (503). The PUCCH resource on which the HARQ control informationand the scheduling request are mapped by the mobile station apparatus isthe PUCCH resource allocated to the mobile station apparatus by the basestation apparatus for transmission of the HARQ control information. Themobile station apparatus generates the HARQ control information based ona reception state of the PDSCHs (or downlink transport blocks) and mapsthe HARQ control information on the PUCCH.

The mobile station apparatus uses the PUCCH resource allocated by thebase station apparatus to transmit the HARQ control information and thescheduling request (504). An error-correcting code may be added to theHARQ control information transmitted from the mobile station apparatusto the base station apparatus. The base station apparatus receives theHARQ control information and the scheduling request transmitted from themobile station apparatus and extracts these pieces of information (505).If an error-correcting code is added to the HARQ control informationtransmitted from the mobile station apparatus to the base stationapparatus, the base station apparatus performs decoding in accordancewith a coding method thereof. The base station apparatus retransmits thedownlink transport blocks to the mobile station apparatus based on theextracted information (the HARQ control information). The base stationapparatus allocates the resource for transmitting uplink data to themobile station apparatus based on the extracted information (thescheduling request). The base station apparatus can allocate to themobile station apparatus the uplink resources on a plurality of uplinkcomponent carriers.

That is, the mobile station apparatus uses the PUCCH resource allocatedfor transmitting the HARQ control information by the base stationapparatus to transmit the HARQ control information for PDCCHs and/orPDSCHs transmitted on a plurality of downlink component carriers.

If the scheduling request is being transmitted in this case, the mobilestation apparatus transmits the HARQ control information for PDCCHsand/or PDSCHs transmitted on a plurality of downlink component carriersas well as the scheduling request for requesting allocation of resourcesfor transmitting the uplink data on a plurality of uplink componentcarriers.

Specifically, the mobile station apparatus can transmit both the HARQcontrol information and the scheduling request even if the HARQ controlinformation is being transmitted at the timing (in the sub-frame)periodically allocated for transmitting the scheduling request by thebase station apparatus. If the transmission of the scheduling requestcoincides in a sub-frame (in a time) with the transmission of the HARQcontrol information, the mobile station apparatus transmits both theHARQ control information and the scheduling request to the base stationapparatus. The mobile station apparatus can use the PUCCH resourceallocated for transmitting the HARQ control information by the basestation apparatus to transmit both the HARQ control information and thescheduling request to the base station apparatus.

For example, the mobile station apparatus transmits both the HARQcontrol information and the scheduling request to the base stationapparatus by reference to a table combining (in other words, jointogether, multiplexing, or bundling) the HARQ control information andthe (information indicative of) scheduling request. For example, themobile station apparatus refers to one table combining the HARQ controlinformation and the scheduling request and selects a bit sequencecorresponding to the HARQ control information and the (informationindicative of) scheduling request to transmit the selected bit sequenceto the base station apparatus. That is, the mobile station apparatus cantransmit both the HARQ control information and the scheduling request tothe base station apparatus by transmitting single bit sequencecorresponding to the HARQ control information and the scheduling requestto the base station apparatus.

FIG. 6 depicts an example of the table combining the HARQ controlinformation and the (information indicative of) scheduling request. Inthe table depicted in FIG. 6, by way of example, the HARQ controlinformation and the (information indicative of) scheduling request arerepresented by (made up of) bit fields of 6 bits. Specifically, in thetable depicted in FIG. 6, byway of example, the bit field for the HARQcontrol information (bit field indicative of the HARQ controlinformation) is represented by a field of 5 bits from the start and thebit field for the (information indicative of) scheduling request isrepresented by a field of the last one bit. In other words, in the tabledepicted in FIG. 6, the bit field for the HARQ control information andthe bit field for the scheduling request are independently prepared. Andthe HARQ control information and the scheduling request are mapped tothe respective bit fields.

By way of example, the table depicted in FIG. 6 is depicted as a tablewhen the base station apparatus configures the setting for the mobilestation apparatus such that communication is performed by using threedownlink component carriers. In other words, the table depicted in FIG.6 is a table that represents of a combination of the HARQ controlinformation and the scheduling request as a bit sequence incase that thenumber of the downlink component carriers is three (the DLCC number 3).By way of example, the table depicted in FIG. 6 is depicted as a tableutilized in case that communication is performed by using three downlinkcomponent carriers; however, a different table may be utilized if thebase station apparatus and the mobile station apparatus performcommunication by using the different number (other than three) ofdownlink component carriers (e.g., four downlink component carriers).

In the table depicted in FIG. 6, five bits from the start indicate thebit field for the HARQ control information and the last one bitindicates the bit field for the scheduling request (SR). Specifically,for example, in a bit sequence “001110”, a bit field “00111” of fivebits from the start indicates the HARQ control information and the lastone bit “0” indicates the information that indicates of the schedulingrequest (WITHOUT SR). For example, in a bit sequence “111111”, a bitfield “11111” of five bits from the start indicates the HARQ controlinformation and a bit field “1” of the last one bit indicates theinformation indicative of the scheduling request (WITH SR). “WITHOUT SR”indicates that the mobile station apparatus does not request the basestation apparatus to allocate UL-SCH resources. “WITH SR” indicates thatthe mobile station apparatus requests the base station apparatus toallocate UL-SCH resources. That is, the mobile station apparatus cannotify the base station apparatus of both states of not requesting theallocation of UL-SCH resource (a negative state) and requesting theallocation of UL-SCH resource (a positive state).

For example, A/N/A in the table of FIG. 6 indicates pieces of the HARQcontrol information for PDSCHs (or downlink transport blocks) onrespective downlink component carriers. In this example, A, N, and Ddenote ACK, NACK, and DTX, respectively. For example, A/N/A in the tableof FIG. 6 indicates ACK for a PDSCH on a certain downlink componentcarrier (e.g., DCC1), NACK for a PDSCH on a certain downlink componentcarrier (e.g., DCC2), and ACK for a PDSCH on a certain downlinkcomponent carrier (e.g., DCC3).

As described above, in case of transmitting both the HARQ controlinformation and the scheduling request to the base station apparatus,the mobile station apparatus refers to the table as depicted in FIG. 6and selects a bit sequence corresponding to the HARQ control informationand the (information indicative of) scheduling request from thereferenced table to transmit the selected bit sequence to the basestation apparatus.

For example, if the HARQ control information for PDSCHs (or downlinktransport blocks) transmitted on three downlink component carriers(e.g., DCC1, DCC2, and DCC3) by the base station apparatus is A/N/N(e.g., the HARQ control information for the PDSCH transmitted on DCC1 isACK; the HARQ control information for the PDSCH transmitted on DCC2 isNACK; and the HARQ control information for the PDSCH transmitted on DCC3is NACK) and “with SR” are being transmitted, the mobile stationapparatus transmits a bit sequence “100101” to the base stationapparatus.

The table combining the HARQ control information and the schedulingrequest as depicted in FIG. 6 is defined in advance in accordance withspecifications etc. The table as depicted in FIG. 6 may be set by thebase station apparatus for the mobile station apparatus by using the RRCsignaling, for example. The base station apparatus and the mobilestation apparatus can share the table as depicted in FIG. 6 in advance.

Similarly, FIG. 7 depicts an example of the table combining the HARQcontrol information and the (information indicative of) schedulingrequest. As is the case with the table depicted in FIG. 6, the HARQcontrol information (ACK, NACK, and DTX) and the (information indicativeof) scheduling request are multiplexed and represented as one bitsequence (8-bit bit sequence in this example) in the table depicted inFIG. 7. That is, one bit sequence (8-bit bit sequence in this example)indicates the HARQ control information and the (information thatindicates) scheduling request. The DLCC number 2 in FIG. 7 indicatesthat the base station apparatus uses two downlink component carriers toperform communication for the mobile station apparatus. The DLCC number3 in FIG. 7 indicates that the base station apparatus uses threedownlink component carriers to perform communication for the mobilestation apparatus.

FIG. 7 depicts bit sequences that indicates a combination of the HARQcontrol information and the scheduling request in (a portion of) thecases when the number of the downlink component carriers used forcommunication set by the base station apparatus is two and three. A bitlength (also referred to as a code word) that indicates the HARQ controlinformation is the same (a bit length of eight bits) regardless of thenumber of the downlink component carriers.

In FIG. 7, for example, A/N in the case of the number of the downlinkcomponent carriers of two indicates the HARQ control information forPDSCHs (or downlink transport blocks) in respective component carriersand indicates ACK for a PDSCH on a certain downlink component carrier(e.g., DCC1) and NACK for a PDSCH on a certain downlink componentcarrier (e.g., DCC2).

In FIG. 7, for example, A/N/D in the case of the number of the downlinkcomponent carriers of three indicates the HARQ control information forPDSCHs (or downlink transport blocks) on respective component carriersand indicates ACK for a PDSCH on a certain downlink component carrier(e.g., DCC1), NACK for a PDSCH on a certain downlink component carrier(e.g., DCC2), and DTX for a PDSCH on a certain downlink componentcarrier (e.g., DCC3).

In FIG. 7, if the number of the downlink component carriers is two,“WITHOUT SR” and “WITH SR” are assigned to the respective states of theHARQ control information (states from A/A to D/D). If the number of thedownlink component carriers is three, bit sequences “10101111” to“11000101” are respectively assigned to A/A/D to N/A/N. These bitsequences are the same bit sequences as “A/A, WITH SR” to “D/D, WITH SR”in the case of the number of the downlink component carriers of two.Although bit sequences “11010000” to “10011110” are not used forindicating the HARQ control information and/or the presence of the SR inthe case of the number of the downlink component carriers of three inFIG. 7, these bit sequences may be used for indicating the HARQ controlinformation and/or the presence of the SR.

By indicating unutilized bit sequences as the HARQ control informationas well as the scheduling request depending on the number of thedownlink component carriers set by the base station apparatus in thisway, an amount of information transmitted by the mobile stationapparatus can be increased without increasing the number of transmittedbits. The base station apparatus can determine a state of the HARQcontrol information and the presence of the scheduling request dependingon the number of the set (activated) downlink component carriers.

As described above, the transmission/reception of the bit sequencescorresponding to the HARQ control information and the scheduling requestby the base station apparatus and the mobile station apparatus enablesefficient transmission of the HARQ control information as well as theother control information even in case that the base station apparatusand the mobile station apparatus perform communication by using a widerfrequency band made up of a plurality of component carriers. Theefficient exchange of these pieces of control information between thebase station apparatus and the mobile station apparatus enablesprovision of a mobile communication system and a mobile communicationmethod that take into consideration of ensuring more resources utilizedin communication.

A whole or a portion of the base station apparatus and the mobilestation apparatus in the embodiments may be implemented as LSI (LargeScale Integration) that is typically an integrated circuit. Thefunctional blocks of the base station apparatus and the mobile stationapparatus may individually be formed as chips, or a whole or a portionof the functional blocks may be integrated into a chip. A technique offorming an integrated circuit may be implemented not only in LSI butalso in a dedicated circuit or a general purpose processor. If advancein semiconductor technology leads to emergence of a technique of formingan integrated circuit alternative to LSI, the integrated circuit fromthe technique is also usable.

As described above, the mobile communication system of the presentinvention is characterized in that, in a mobile communication system inwhich a base station apparatus and a mobile station apparatus thatperform communication by using a plurality of component carriers, thebase station apparatus allocates to the mobile station apparatus aresource for transmission of HARQ control information by the mobilestation apparatus and that the mobile station apparatus transmits to thebase station apparatus the HARQ control information for physicaldownlink control channels and/or physical downlink shared channelstransmitted on a plurality of downlink component carriers as well as ascheduling request requesting allocation for transmission of uplinkdata, by using the allocated resource.

The mobile communication system is characterized in that, in the mobilecommunication system in which a base station apparatus and a mobilestation apparatus that perform communication by using a plurality ofcomponent carriers, the base station apparatus allocates to the mobilestation apparatus a resource for transmission of a scheduling request bythe mobile station apparatus and allocates to the mobile stationapparatus a resource for transmission of HARQ control information by themobile station apparatus and that the mobile station apparatus transmitsto the base station apparatus the HARQ control information for physicaldownlink control channels and/or physical downlink shared channelstransmitted on a plurality of downlink component carriers as well as thescheduling request requesting a resource for transmission of uplinkdata, by using the resource for transmission of the HARQ controlinformation.

The mobile communication system is characterized in that the mobilestation apparatus refers to one table combining the HARQ controlinformation and the scheduling request.

The mobile communication system is characterized in that the mobilestation apparatus refers to one table combining the HARQ controlinformation and the scheduling request and selects a bit sequencecorresponding to the HARQ control information and the scheduling requestfrom the referenced table to transmit the selected bit sequence to thebase station apparatus.

A base station apparatus in a mobile communication system in which thebase station apparatus and a mobile station apparatus that performcommunication by using a plurality of component carriers ischaracterized in that the base station apparatus comprises a means forallocating to the mobile station apparatus a resource for transmissionof HARQ control information by the mobile station apparatus; and a meansfor receiving from the mobile station apparatus the HARQ controlinformation for physical downlink control channels and/or physicaldownlink shared channels transmitted on a plurality of downlinkcomponent carriers as well as a scheduling request requesting allocationfor transmission of uplink data, by using the allocated resource.

A base station apparatus in a mobile communication system in which thebase station apparatus and a mobile station apparatus that performcommunication by using a plurality of component carriers ischaracterized in that the base station apparatus comprises a means forallocating to the mobile station apparatus a resource for transmissionof a scheduling request by the mobile station apparatus; a means forallocating to the mobile station apparatus a resource for transmissionof HARQ control information by the mobile station apparatus; and a meansfor receiving from the mobile station apparatus the HARQ controlinformation for physical downlink control channels and/or physicaldownlink shared channels transmitted on a plurality of downlinkcomponent carriers as well as the scheduling request requesting aresource for transmission of uplink data, by using the resource fortransmission of the HARQ control information.

A mobile station apparatus in a mobile communication system in whichabase station apparatus and the mobile station apparatus that performcommunication by using a plurality of component carriers ischaracterized in that the mobile station apparatus comprises a means forhaving a resource for transmission of HARQ control information allocatedby the base station apparatus; and a means for transmitting to the basestation apparatus the HARQ control information for physical downlinkcontrol channels and/or physical downlink shared channels transmitted ona plurality of downlink component carriers as well as a schedulingrequest requesting allocation for transmission of uplink data, by usingthe allocated resource.

A mobile station apparatus in a mobile communication system in whichabase station apparatus and the mobile station apparatus that performcommunication by using a plurality of component carriers ischaracterized in that the mobile station apparatus comprises a means forhaving a resource for transmission of a scheduling request allocated bythe base station apparatus; a means for having a resource fortransmission of HARQ control information allocated by the base stationapparatus; and a means for transmitting to the base station apparatusthe HARQ control information for physical downlink control channelsand/or physical downlink shared channels transmitted on a plurality ofdownlink component carriers as well as the scheduling request requestinga resource for transmission of uplink data, by using the resource fortransmission of the HARQ control information.

The mobile station apparatus is characterized in that the means fortransmitting to the base station apparatus the HARQ control informationas well as the scheduling request refers to one table combining the HARQcontrol information and the scheduling request.

The mobile station apparatus is characterized in that the means fortransmitting to the base station apparatus the HARQ control informationas well as the scheduling request refers to one table combining the HARQcontrol information and the scheduling request and selects a bitsequence corresponding to the HARQ control information and thescheduling request from the referenced table to transmit the selectedbit sequence to the base station apparatus.

A communication method of a base station apparatus in a mobilecommunication system in which the base station apparatus and a mobilestation apparatus that perform communication by using a plurality ofcomponent carriers is characterized in that the method comprises a stepof allocating to the mobile station apparatus a resource fortransmission of HARQ control information by the mobile stationapparatus; and a step of receiving from the mobile station apparatus theHARQ control information for physical downlink control channels and/orphysical downlink shared channels transmitted on a plurality of downlinkcomponent carriers as well as a scheduling request requesting allocationfor transmission of uplink data, by using the allocated resource.

A communication method of a base station apparatus in a mobilecommunication system in which the base station apparatus and a mobilestation apparatus that perform communication by using a plurality ofcomponent carriers is characterized in that the base station apparatusallocates to the mobile station apparatus a resource for transmission ofa scheduling request by the mobile station apparatus; allocates to themobile station apparatus a resource for transmission of HARQ controlinformation; and receives from the mobile station apparatus the HARQcontrol information for physical downlink control channels and/orphysical downlink shared channels transmitted on a plurality of downlinkcomponent carriers as well as the scheduling request requesting aresource for transmission of uplink data by using the resource fortransmission of the HARQ control information.

A communication method of a mobile station apparatus in a mobilecommunication system in which a base station apparatus and the mobilestation apparatus that perform communication by using a plurality ofcomponent carriers is characterized in that a resource for transmissionof HARQ control information is allocated by the base station apparatus;and the HARQ control information for physical downlink control channelsand/or physical downlink shared channels transmitted on a plurality ofdownlink component carriers as well as a scheduling request requestingallocation for transmission of uplink data is transmitted to the basestation apparatus by using the allocated resource.

A communication method of a mobile station apparatus in a mobilecommunication system in which a base station apparatus and the mobilestation apparatus that perform communication by using a plurality ofcomponent carriers is characterized in that a resource for transmissionof a scheduling request is allocated by the base station apparatus; aresource for transmission of HARQ control information is allocated bythe base station apparatus; and the HARQ control information forphysical downlink control channels and/or physical downlink sharedchannels transmitted on a plurality of downlink component carriers aswell as the scheduling request requesting a resource for transmission ofuplink data is transmitted to the base station apparatus by using theresource for transmission of the HARQ control information.

The communication method is characterized in that the mobile stationapparatus refers to one table combining the HARQ control information andthe scheduling request.

The communication method is characterized in that the mobile stationapparatus refers to one table combining the HARQ control information andthe scheduling request and selects a bit sequence corresponding to theHARQ control information and the scheduling request from the referencedtable to transmit the selected bit sequence to the base stationapparatus.

An integrated circuit mounted on a base station apparatus and fulfillinga plurality of functions of the base station apparatus is characterizedin that the base station apparatus executes a function of allocating toa mobile station apparatus a resource for transmission of HARQ controlinformation by the mobile station apparatus; and a function of receivingfrom the mobile station apparatus the HARQ control information forphysical downlink control channels and/or physical downlink sharedchannels transmitted on a plurality of downlink component carriers aswell as a scheduling request requesting allocation for transmission ofuplink data by using the allocated resource.

An integrated circuit mounted on a mobile station apparatus andfulfilling of the mobile station apparatus a plurality of functions ischaracterized in that the mobile station apparatus executes a functionof having a resource for transmission of HARQ control informationallocated by a base station apparatus; and a function of transmitting tothe base station apparatus the HARQ control information for physicaldownlink control channels and/or physical downlink shared channelstransmitted on a plurality of downlink component carriers as well as ascheduling request requesting allocation for transmission of uplinkdata, by using the allocated resource.

EXPLANATIONS OF LETTERS OR NUMERALS

200 . . . base station apparatus; 201 . . . data control portion; 202 .. . OFDM modulating portion; 203 . . . radio portion; 204 . . .scheduling portion; 205 . . . channel estimating portion; 206 . . .DFT-S-OFDM demodulating portion; 207 . . . data extracting portion; 208. . . higher layer; 209 . . . radio resource control portion; 300 . . .mobile station apparatus; 301 . . . data control portion; 302 . . .DFT-S-OFDM modulating portion; 303 . . . radio portion; 304 . . .scheduling portion; 305 . . . channel estimating portion; 306 . . . OFDMdemodulating portion; 307 . . . data extracting portion; 308 . . .higher layer; and 309 . . . radio resource control portion.

The invention claimed is:
 1. A base station apparatus configured tocommunicate with a mobile station apparatus using a plurality ofdownlink component carriers, the base station apparatus comprising: atransmitting unit configured to transmit using a higher layer signal,first information used for configuring a physical uplink control channelresource, the physical uplink control channel resource being used for areception of a scheduling request, transmit using a higher layer signal,second information used for configuring a plurality of physical uplinkcontrol channel resources, and transmit using a physical downlinkcontrol channel, third information used for indicating one physicaluplink control channel resource from among the plurality of physicaluplink control channel resources, the one physical uplink controlchannel resource being used for a reception of Hybrid Automatic RepeatRequest (HARQ) control information, wherein in a case of a reception ofthe HARQ control information and the scheduling request in a subframe, abit of the scheduling request is appended at the end of a bit sequenceof the HARQ control information.
 2. The base station apparatus asdefined in claim 1, wherein the scheduling request is one-bitinformation indicating that a scheduling is requested or that thescheduling is not requested.
 3. The base station apparatus as defined inclaim 1 wherein the plurality of physical uplink control channelresources configured using the second information are four physicaluplink control channel resources.
 4. The base station apparatus asdefined in claim 1, wherein the HARQ control information includesinformation indicative of a positive acknowledgement.
 5. The basestation apparatus as defined in claim 1, wherein the HARQ controlinformation includes information indicative of a positiveacknowledgement or a negative acknowledgement.
 6. A base stationapparatus configured to communicate with a mobile station apparatususing a plurality of downlink component carriers, the base stationapparatus comprising: a transmitting unit configured to transmit using ahigher layer signal, first information used for configuring a physicaluplink control channel resource, the physical uplink control channelresource being used for a reception of a scheduling request, transmitusing a higher layer signal, second information used for configuring aplurality of physical uplink control channel resources, and transmitusing a physical downlink control channel, third information used forindicating one physical uplink control channel resource from among theplurality of physical uplink control channel resources, the one physicaluplink control channel resource being used for a reception of HybridAutomatic Repeat Request (HARQ) control information; and a receivingunit configured to, in a case that a subframe for a transmission of theHARQ control information using the one physical uplink control channelresource coincides with a subframe for a transmission of the schedulingrequest, receive in the subframe for the transmission of the schedulingrequest, the HARQ control information and the scheduling using the onephysical uplink control channel resource.
 7. The base station apparatusas defined in claim 6, wherein a bit of the scheduling request isappended at the end of a bit sequence of the HARQ control information.8. The base station apparatus as defined in claim 6, wherein thescheduling request is one-bit information indicating that a schedulingis requested or that the scheduling is not requested.
 9. The basestation apparatus as defined in claim 6, wherein the plurality ofphysical uplink control channel resources configured using the secondinformation are four physical uplink control channel resources.
 10. Thebase station apparatus as defined in claim 6, wherein the HARQ controlinformation includes information indicative of a positiveacknowledgement.
 11. The base station apparatus as defined in claim 6,wherein the HARQ control information includes information indicative ofa negative acknowledgement.
 12. The base station apparatus as defined inclaim 6, wherein the HARQ control information includes informationindicative of a positive acknowledgement or a negative acknowledgement.13. A mobile station apparatus configured to communicate with a basestation apparatus using a plurality of downlink component carriers, themobile station apparatus comprising: a receiving unit configured toreceive using a higher layer signal, first information used forconfiguring a physical uplink control channel resource, the physicaluplink control channel resource being used for a transmission of ascheduling request, receive using a higher layer signal, secondinformation used for configuring a plurality of physical uplink controlchannel resources, and receive using a physical downlink controlchannel, third information used for indicating one physical uplinkcontrol channel resource from among the plurality of physical uplinkcontrol channel resources, the one physical uplink control channelresource being used for a transmission of Hybrid Automatic RepeatRequest (HARQ) control information; and a transmission unit configuredto, in a case that a subframe for the transmission of the HARQ controlinformation using the one physical uplink control channel resourcecoincides with a subframe for the transmission of the schedulingrequest, transmit in the subframe for the transmission of the schedulingrequest, to the base station apparatus, the HARQ control information andthe scheduling using the one physical uplink control channel resource.14. The mobile station apparatus as defined in claim 13, wherein a bitof the scheduling request is appended at the end of a bit sequence ofthe HARQ control information.
 15. The mobile station apparatus asdefined in claim 13, wherein the scheduling request is one-bitinformation indicating that a scheduling is requested or that thescheduling is not requested.
 16. The mobile station apparatus as definedin claim 13, wherein the plurality of physical uplink control channelresources configured using the second information are four physicaluplink control channel resources.
 17. The mobile station apparatus asdefined in claim 13, wherein the HARQ control information includesinformation indicative of a positive acknowledgement.
 18. The mobilestation apparatus as defined in claim 13, wherein the HARQ controlinformation includes information indicative of a negativeacknowledgement.
 19. The mobile station apparatus as defined in claim13, wherein the HARQ control information includes information indicativeof a positive acknowledgement or a negative acknowledgement.